Tummala Electronics Pvt. Ltd. Offers Power Supply Unit for Signal Post Telephone. Tummala Electronics Pvt. Ltd. Manufactures Railway Communication Equipment, Solar Water Heaters and Solar Powered Lighting Systems. The Power Supply Unit for Signal Post Telephone provides stable 12 V D.C. Power to a Signal Post [Master] Telephone Unit along with automatic battery backup during power failure. This system works off 220V mains and charges the battery using a constant voltage current limited mode of charging. A maintenance free sealed battery is housed inside the charger unit. Whenever there is a power interruption it is immediately detected and the internal battery is brought into circuit, hence it can provide uninterrupted DC power without any external connections.
The back panel of Power Supply Unit for Signal Post Telephone carries the DC and AC fuses along with the DC outlet. A switch is provided to cut off the battery from the circuit when the charger is not in use.
